ikiwiki: Re-run setup for each site after restore

Closes: #2028.

Tests:

- Backup and restore with no sites.

- Backup and restore with one wiki and one blog. Confirm that login
  works for both sites.

- Backup from one container, and restore in another container. Confirm
  that login works for both sites.

Signed-off-by: James Valleroy <jvalleroy@mailbox.org>
Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>

plinth/modules/ikiwiki/__init__.py

@@ -74,8 +74,8 @@ class IkiwikiApp(app_module.App):
                                           groups=groups)
         self.add(users_and_groups)
 
-        backup_restore = BackupRestore('backup-restore-ikiwiki',
-                                       **manifest.backup)
+        backup_restore = IkiwikiBackupRestore('backup-restore-ikiwiki',
+                                              **manifest.backup)
         self.add(backup_restore)
 
     def post_init(self):
@@ -111,3 +111,14 @@ class IkiwikiApp(app_module.App):
         super().setup(old_version)
         privileged.setup()
         self.enable()
+
+
+class IkiwikiBackupRestore(BackupRestore):
+    """Component to handle Ikiwiki restore"""
+
+    def restore_post(self, packet):
+        """Re-run setup for each wiki after restore."""
+        super().restore_post(packet)
+        sites = privileged.get_sites()
+        for site in sites:
+            privileged.setup_site(site[0])

plinth/modules/ikiwiki/privileged.py

@@ -78,6 +78,13 @@ def create_blog(blog_name: str, admin_name: str, admin_password: str):
                                                     PERL_UNICODE='AS'))
 
 
+@privileged
+def setup_site(site_name: str):
+    """Run setup for a site."""
+    setup_path = os.path.join(WIKI_PATH, site_name + '.setup')
+    subprocess.run(['ikiwiki', '-setup', setup_path], check=True)
+
+
 @privileged
 def delete(name: str):
     """Delete a wiki or blog."""